Subcritical Water Regeneration of Supported Ruthenium Catalyst Poisoned by Sulfur

Subcritical Water Regeneration of Supported Ruthenium Catalyst Poisoned by Sulfur

A titania-supported ruthenium (Ru/TiO2) catalyst was effective for the gasification of lignin to methane, carbon dioxide, and hydrogen in supercritical water. For the Ru/TiO2 catalyst poisoned by sulfur (S−Ru/TiO2), the overall gas yield decreased and the tetrahydrofuran-insoluble products (namely,...

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Veröffentlicht in:Energy & fuels 2008-03, Vol.22 (2), p.845-849
Hauptverfasser: Osada, Mitsumasa, Hiyoshi, Norihito, Sato, Osamu, Arai, Kunio, Shirai, Masayuki
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Applied sciences
Biomass
Catalysis and Kinetics
Energy
Exact sciences and technology
Natural energy
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container_end_page 849
container_issue 2
container_start_page 845
container_title Energy & fuels
container_volume 22
creator Osada, Mitsumasa
Hiyoshi, Norihito
Sato, Osamu
Arai, Kunio
Shirai, Masayuki
description A titania-supported ruthenium (Ru/TiO2) catalyst was effective for the gasification of lignin to methane, carbon dioxide, and hydrogen in supercritical water. For the Ru/TiO2 catalyst poisoned by sulfur (S−Ru/TiO2), the overall gas yield decreased and the tetrahydrofuran-insoluble products (namely, char) were slightly formed in supercritical water gasification. After subcritical water treatments of the S−Ru/TiO2 catalyst at 523 and 573 K, its gasification activity was found to be higher than that without the treatment. On the other hand, the treatment of the S−Ru/TiO2 catalyst in supercritical water at 673 K showed lower activity than that in subcritical water. X-ray photoelectron spectroscopy analysis showed that three-fourths of the amount of sulfur was removed from the catalyst surface after the subcritical water treatment. It was concluded that deactivated catalysts poisoned by sulfur species could be regenerated by the removal of the sulfur by the treatment with subcritical water.
doi_str_mv 10.1021/ef7005194
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subjects Applied sciences
Biomass
Catalysis and Kinetics
Energy
Exact sciences and technology
Natural energy
title Subcritical Water Regeneration of Supported Ruthenium Catalyst Poisoned by Sulfur
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